Provide separate module with Pulsar v1 client API wrapper (apache#3228)

* Provide separate module with Pulsar v1 client API wrapper

* Use impl classes rather than API

* Brought back DefaultSchemasTest.testStringSchema

pom.xml

@@ -84,6 +84,7 @@ flexible messaging model and an intuitive client API.</description>
     <module>pulsar-client-api</module>
     <module>pulsar-client</module>
     <module>pulsar-client-shaded</module>
+    <module>pulsar-client-1x-base</module>
     <module>pulsar-client-admin</module>
     <module>pulsar-client-admin-shaded</module>
     <module>pulsar-client-tools</module>

pulsar-client-1x-base/pom.xml

@@ -0,0 +1,40 @@
+<!--
+
+    Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.apache.pulsar</groupId>
+    <artifactId>pulsar</artifactId>
+    <version>2.3.0-SNAPSHOT</version>
+    <relativePath>..</relativePath>
+  </parent>
+
+  <artifactId>pulsar-client-1x-base</artifactId>
+  <name>Pulsar Client 1.x Compatibility Base</name>
+  <packaging>pom</packaging>
+
+  <modules>
+      <module>pulsar-client-2x-shaded</module>
+      <module>pulsar-client-1x</module>
+  </modules>
+</project>

pulsar-client-1x-base/pulsar-client-1x/pom.xml

@@ -0,0 +1,52 @@
+<!--
+
+    Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.apache.pulsar</groupId>
+    <artifactId>pulsar-client-1x-base</artifactId>
+    <version>2.3.0-SNAPSHOT</version>
+    <relativePath>..</relativePath>
+  </parent>
+
+  <artifactId>pulsar-client-1x</artifactId>
+  <name>Pulsar Client 1.x Compatibility API</name>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.pulsar</groupId>
+      <artifactId>pulsar-client-2x-shaded</artifactId>
+      <version>${project.parent.version}</version>
+    </dependency>
+
+    <dependency>
+      <groupId>com.google.guava</groupId>
+      <artifactId>guava</artifactId>
+    </dependency>
+
+    <dependency>
+        <groupId>org.apache.commons</groupId>
+        <artifactId>commons-lang3</artifactId>
+      </dependency>
+  </dependencies>
+</project>